… manage to do any wood-cutting today. But there’s a good reason for that – in fact, 6.5mm of it. Yes, for the first time since I’m not sure when, we’ve had a persistent rainfall throughout most of the day.
So I was awake at 07:30 but it was about 08:15 when I finally crawled out of bed. And after breakfast I cracked on with my studies. I’m really getting into this.
I didn’t have lunch today either, but I was downstairs working. Or, at least, trying to work. But with more than 10 weeks away from work I can’t find half of the tools that I need, despite turning the house upside-down a couple of times.
But what I’ve done it to start work on the new Version 4 of the home-made 12-volt immersion heater. And I’ll tell anyone before we even start that this one is not destined to last very long. The plastic box isn’t anything like as strong as I would like it to be, and it’s rather brittle. It shouldn’t be brittle as that will be more likely to crack up under heat. I need a proper water tank or, better still, a copper-sided container of about 25 litres. I must look into this properly.
But at least the holes are drilled into it and the tap and element fitted. It’s now sitting on a dry dusty concrete floor so that I can check if there are any leaks.
But one design change that I’m doing (apart from the obvious one of repositioning the heater element so I’m not falling over the wires) concerns the element. It’s two x 250-watt elements connected by bridge pieces and held together by screws into captive nuts. You need to undo the screws to connect the wires and then screw it back together and this is one of the faults – that you can’t tighten up the screws sufficiently tight to prevent arcing.
What I’ve done is to do away with the bridge pieces so that I have the two elements separate. I’ve put nuts and bolts in through the holes on the elements and what I’ll be doing is to run two sets of wires, not just one, to the immersion heater, and bolting them up rather than screwing them. This will mean that the joints will be tighter thanks to the bolts, and that with two wires then there will be less amperage running down each cable so they won’t heat up as much.
Another advantage of this is that in the summer with all of the excess energy that we receive, I can start a second immersion heater and disconnect one set of wires from one of the elements on the first one and wire them to one element on the other immersion heater. That way I’ll have 50 litres of water and that will warm up quite steadily.
But these aren’t long-term solutions of course. I must have a proper immersion heater with proper joints and a proper element connection. But trying to find anything suitable is well-nigh impossible.
Back up here I sat down to watch a film but went straight to sleep for half an hour. And for tea, I had my lunchtime butties.
Now, I’m off to bed. See you in the morning.
